Stocholders' Equity (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Schedule of Weighted Average Number of Shares [Table Text Block]

The following table provides the computation of diluted weighted average number of common shares outstanding:

	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Computation of diluted weighted average shares outstanding:
Basic weighted average shares outstanding	52,061,158	51,935,757	52,373,462	51,804,459
Incremental shares from assumed exercise of stock options and vesting of restricted stock	1,720,448	1,722,747	1,666,114	1,688,121
Diluted weighted average shares outstanding	53,781,606	53,658,504	54,039,576	53,492,580